The problem is if someone is able to activate your camera even if the light comes on 100 percent of the time, without a cover they’ll see something and will be able to capture that. Hey this guy hacked in and is seeing naked wife or my taxes on my desk or something else sensitive - the light isn’t really going to stop that. If you really don’t believe me go stay in a hotel next to defcon and use the hotel WiFi naked.
Do you believe that zero days don't exist? You think your laptop is absolutely hack proof?
A hacker isn't going to randomly burn their exploits, but that doesn't mean none exist.
I don't believe that zero days exist in a circuit, no. The LED is not software. You cannot power up the camera without powering up the LED.